Multiple-walled bag



iS-LW93U- J. E. CORNELL MULTIPLE wALLED BAG l Original Filed June 'l53mm/nto@ Jaim E CORNELL Patented 'Api'. l, 1930 UNITED sTATEs PATENTOFFICE JOHN E. CORNELL, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNEASSIGNMENTS, TO BATES VALVE BAG CORPORATION, OF. CHICAGO, ILLINOIS, ACORPORATION OF NEW JERSEY MULTIPLE-WALLET) BAG Application. led June1925, Serial No. 37,014. vRenewed.` October 3, 1929.y

My invention relates to multiple-walled 15 another stage of manufacture.

A In forming the bag disclosed in Fig. 1, a sheet of paper 10 isprovided wlth continuous longitudinal strips of adhesive. The strips of'adhesive which are shown in the drawings are numbered from 11 to 17inclusive, in

order to aid in vunderstanding the positions of the several lines ofadhesive at the succes- 5 sive stages. After adhesive has been appliedto sheet 10, another sheet 18 is superimposed upon sheet 10 and isadhered thereto by the strips of adhesive. Preferably the two sheets ofpaper are offset, as clearly shown in Fig. 2.

The two` sheets are folded so as to form a $0 tube, the edges of thesheets being united by strips of adhesive 19 and 20. The tube is thencut up into bag lengths. Fig. 3 shows the relative position of thevarious strips of adhesive at the end .of such a bag length.

If desired, one end only of the bag may be closed and the other end leftopen for filling purposes, in which -case the strips of adhesive wouldhold the sheets of paper together at the -mouth of 'the bag'suffcientlyto prevent material between the layers of the walls instead of intovtheinside tube. In the form shown, however, the end of the tube is slittedfor aA short distance at 21 and 22, and the flaps 23 and 24 betweenthese slits and the ed es of the tube are then folded in as shown inig.1, and thereafter the iap 25 between slits 21 and 22 on the sidesopposite the seam is folded over iaps 23 and 24, and finally flap 26,between slits 21, and 22v on the seam serious trouble being occasionedby filling side of the tube, is folded overv flap 25 and adhered theretoin any suitable manner. If desired, flap 25 may be adhered to flaps 23and 24, but I prefer to leave at least one of flaps 23 and 24 loose soas to form a valve 55 opening.

The bottom of the bag is closed in a similar manner, by first bendinginward the edge flaps 27 and 28, thereafter bendin downward Hap 29 onthe seam side of the bag, and finally bending upward fia 30 on the sideof the bag opposite the seam. While the two ends may be closed in asimilar manner, I prefer to form the bottom with wider flaps, as shown,and consider it preferable to adhere 6 these wider aps 27 and 28 to theflap 29 which is folded thereover.

As will be seen, a bag formed in this manner has a plurality of stripsof adhesive lon-v gitudinally of the bag, but none of these. strips comeat the edge of the bag, or where the valve laps'are formed. The valveflaps composed of a plurality of relatively mova ble layers are morepliable and close better than similar flaps formed of a single sheet orof a plurality of sheets pasted together. However, they do occur withsuiicientfrequency to unite the layers which form flaps 26 and 30 andprevent trouble from the separation of their edges. At the same time,the longitudinal parallel strips of Vadhesive do not seriously interferewith the bending movements ofthe bag while it is being collapsed orexpanded. The number and location of strips of adhesive shown in thedrawings are satisfactory, but may be varied with -inY considerablelimits, if desired.

While it is a more simple process'to apply continuous strips of.adhesive than it would be to apply broken strips, it will be understoodthat it is not necessary to have the strips continuous in all c-ases,and, while it is` enerally preferable to apply these stripsongitudinally of the material, it might be found advantageous, undersome circumstances, toy apply the strips transversely of the tube. Ineither case, it is preferable to maintain these strips-substantiallyparallel, because they interfere less with'the bending of the walls ofthe bag when they bear this parallelA relation to each other than ifthey were at an angle to each other.

The superimposed sheets may be folded either way to form a tube, butthey are shown with lsheet 10 on the outside. The depth of slits 21 and22 and the extent of the. side flaps may be varied as desired. Theproportions are such in the bag shown that i'laps 25 and 26 are lappednearly twice the depth of the cuts, while on the bottom of the bag, aps29 and 30 are lapped only to the extent of the depth of the cuts. Outerlayer 10 1s broken away at the ends of outer flaps 26 and 30', so as toshow more clearly the position of the adhesive between layers 10 and 18at the ends of these outer iaps, where the presence of the adhesive ismost essential.

While I have disclosed my invention as applied to a valved paper bagformed of two layers of paper, it will be understood that my inventionis capable of application to other forms of bag and may be used where.more than two layers of paper are employed. Various departures may bemade from the bag shown and described, within the scope of the appendedclaims which define my invention.

What I claim is: 1. A bag having walls comprising a plurality of layersof paper and having an end closure formed by folding upon each otherflaps formed from the end of the bag walls, the several layers of paperconstituting the walls being united by separate lonrritudinal parallelstrips of adhesive, said strlps being so placedthat they Iunite theseverallayers of the outer iap of the end closure, and one of the innerflaps being suitable for forming a valve and belng unsecured by adhesiveto any other fla and' the longitudinal strips of 40 adhesive eingsolocated-that none of them occur in said inner flap.l

2; A bag having walls comprising a plurality of layers of paper, one endof the bag being closed by folding upon each other flaps 4,5-` formed bythe bag walls, the several layers of the wall forming the outer edge ofthe outer flap being secured together, and the several layers of thewall forming one of the inner flaps being free from adhesive and movablerelative to each other, and said inner liap being suitable for forming avalve.

In testimony whereof, I have hereunto signed my nameto thisspeciication.

JOHN E. CORNELL.

